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Finding the Fourth Proportional to 138.39, 191.89 and 133.77

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Solution

The fourth proportional to 138.39, 191.89 and 133.77 is: 185.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.39 : 191.89 = 133.77 : x
  2. Step 2: Convert to fraction form
    138.39/191.89 = 133.77/x
  3. Step 3: Cross multiply
    138.39x = 191.89 × 133.77
  4. Step 4: Simplify right side
    138.39x = 25,668.46
  5. Step 5: Solve for x
    x = 25,668.46/138.39
  6. Step 6: Final answer
    x = 185.49

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.